#ifndef __FIELD_H__
#define __FIELD_H__
/// Particle content of program
enum field{
  no_field, // no field is attached to vertex
  phi,      // Scalar  field phi4
  e,        // electron
  E,        // positron
  A,        // photon
  A_xi};       // photon in R_xi gauge
#endif // __FIELD_H__
